Thermotelephone or the like.



B WZDZ. THEEMOTELEPHONE OR THE LIKE.

APPLICATION FILED NOV.15, 191 2.

Patented June 10, 1913.

BRGNISLAW GWGZDZ, 0F SCHfiNEEfGE'EE, NEAR BERLIN, GERMANY.

'THERMOIELELPHONE GR THE LIKE.

aha-sari.

Specification of Letters Patent.

Patented June so, was.

Application filed November 15,1912. Serial No. 731,557.

To all whom it may concern Be it known-that LBRONISLAW Gwoin, a subject of. the Czar of Russia, residing at Schoneiche, near Berlin, Germany, have invented 'cei'tain new and useful li'nproveinents in Thermotelephoncs or the Like, of which the following is a specification.

, My invention relates to thermo-telephones or the like of the type described and illustrated in my United States Patent No. 998965. In this patent the entire cast surrounding the hotwire is produced from a liquid or plastic, subsequently hardening mass, whose composition may vary in itself but is preferably a wax composition, be cause such a one can be best treated. ln cases in .which it is probable that the hot wire will be subjected to somewhat severe mechanical influences, and in which consequently, a cast consisting of the mentioned mass might under certaincircumstances be injured, I prefer to make the same of a firm and hard material 0. 5 metal. ebonite or the like, in the manner which will be understood-from the accompanying drawings, and suitably to embed the -Wollaston wire in it.

In the accompanying drawings Figure 1 shows a vertical section of the body and Fig. 2 a bottom view of Fig. 1. Fig. 3 another form' of the body and Fig. a a bottom View of Fig. Figs. 5 and 6 show details. Fig. 7 shows a vertical section and Fig. 8 a bottom view of another embodiment of the invention and Fig. 9 a further embodiment of the invention.

In the form shown in Fig. 1 the numeral 11 designates such a block-like body composed of metal, ebonite, wood or the like having two holes 12 through it. These holes may be either smooth or tapped or provided with internal projections in order certainly to secure the filling material therein. The two ends 13 of Wollaston wire are placed through these holes 12 in the block 11 and into a templet '14 having recess whose sides correspond to that of the bow 15 of the Vollaston wire. The shape of this templet may be as desired; it is preferable however to employ the form shown in Figs. 3 and 4: or in Figs. 5 and 6. In the illustrative embodiment shown in Figs. 3

and 4 the templet has the form of a socket 16 which is elastic owing to incisions 17, so that the block-like body 11 placed in this socket is securely held. In the bottom' of the wire bow, so that this lug almost com-- pletely covers the slot in the end of the socket 16 and allows only the limbs of the wire bow to pass through the same. This lateral lug 21 is preferably so unitedwith the f-shaped how 18 that it must participate in the rotation of this bow and in the one position of the wire how 15 projects freely througl'i the slot of the templet 16,

but in the closed position. closes the slot in the above described manner. Simultaneously, the length of the wire how 15 is six-- actlydetermined by the V-shaped how 18.

In the illustrative embodiment represented in Figs. 5 and 6 the special socket 161s omitted, but a plate 16 solely is used which however has preferably dowel-like projections 22 on which the block-like body 11, having corresponding recesses, is placed, so that the position of this body is exactly determined bythe projections 22. The plate 16 has also a. slot-like aperture 23 through whichthe wire bow passes, and attached to the bottom of this plate is a V or U-shaped member 18 which however does not require to be rotatable. I

If after placing the block 11 and the wire bow carried thereby on the plate 16 it is wished to close the remainder of the aperture or slot- 23 in order to prevent the mass poured into the holes 12 flowing thereout, a slide-like body 24 may be employed which is guided in dove-tail grooves in the plate and is stopped by one of the projections 22. This slide can be shifted so that'in its one end position it leaves the slot 23 perfectly free for the insertion of the wire bow, while in its other end position it covers over a part of the slot 523 and allows only the limbs of the wire bow to pass through. Obviously, other forms of tomplet may be employed without}. departing from the scope ofthe invention.

lVl1en the length of the wire how has been exactly determined by inserting the block 11 in the templet 1e (Fig. 1) the holes 12 in the block are filled with any suitable plastic or liquid, subsequently hardening mass, by the same being poured, pressed or squirtedin. It is then only necessary to perform the .corrosive process in order to liberate the wire bow 15 from its'envelop of silver. If the block-l1 1s composed of. acid-resisting in acid, 6. g. brass, the mass-ffilled into the holes 12 on the one hand serves as insulation for the Wollaston wire, but, on the other hand, before the corrosive process is carried out, the block must be provided with a coat which is composed of a material of any kind insoluble in acid. This coat can be produced, for example, by applying a liquid material by means of a brush even before the .wire bow has beenfixed in position if desired, and at least that surface of the block-like body from whichthe portion of Wire which is to be corroded projects must be provided in this manner with such a coat. When this coat is employed, therefore, the metal block cannot be impaired by the corrosive process, Such a metal block is preferable in certain cases, because it can be at once employed as an electrically conducting body in the case of the telephone,.in which event the one limb 13 of the Wollaston wire must be electrically connected with it, (3:. g. by soldering, as will be understood from Figs. 3 to 7. 7

'In the illustrative embodiment shown in Figs. 7 and 8 the principle and mode of operation are substantially the same, but here the block-like body 11 has through it only one single hole'lZ in which are located the twolimbs 13 of the VVollaston wire secured in position by the mass filled into the body 11. The size and the shape of the wire bow 15 can be determined by a special templet let, using if preferred the means represented in Figs. 3 and a or those in Figs. 5

w and 6.

mounted that it projects out of the block.

Further, I employ for making the block a case 11, having for. example the shape of -a cylindrical cup, of metal or other suitable material and having in its bottom a hole 27, whereas the edge of its upper part is bent somewhat inward. In addition, near the edge of the hole 27 is a second small hole 28' into which the lower end of the VVollaston wire is inserted and secureil preferably by inseam soldering, riveting or otherwise. Vi hen this has been done the case and the VJo-ilaston wire are inserted in a templet or mold, e. g. of the kind shown in Figs. 3 and i or in Figs. 5 and 6, which securely holds the case 11 in its position and also exactly determines the size and length of the wire bow 15. When these preliminaries are completed the case 11 filled with a suitable insulating material insoluble in acid, preferably a wax composition, so that with the exception of that end of the bow 15 which is subsequently to form the hot wire and a part of the eye 26 at its other end which can be used as a contact the Wollaston wire is completelyenvelopcd. This case 11 is here assumed to be of metal so that it can be used 1 as a contact as the one end of the l i oL- laston wire is attached to it. Obviously, the case must be provided with an acidproof coating before the corrosive process.

treated by the corrosive is not contacted by w or covered with the coating In this form the block-like body may have any desired.

section without departing from the scope of the mventio-n; likewise, a cyhnder may be used. 1nstead of the case or box. Obviously,

a Vvollastou band instead of a Nollaston wire may be employed without departing from the scope of the invention.

What I claim is 2- 1. In a thermo-telephone, the combinatio with a plastic hardening body, of a Nollaston wire passing through: the body and having a bent portion thereof projecting out of the same, and a hard body surrounding and protecting the plastic hardening body.

2. In a thermo-telephone, the combination with a plastic hardening body, of a Wol-laston wire passing through the body and having a bent portion projecting out of the same, and a metal body surrounding and protecting the plastic hardening body.

3. In a thermo-telephone, the combination with a plastic hardening body, of a Noll-aston wire passing through the body and having a bent portion projecting out of the same, and a metal body surrounding and,

ston wlre passing through .9 bDdy-and having a bent portion projecting out of the same, a metal body surrounding and protecting the plastic hardening body, and a socket carrying the outer body, the socket being provided with a bow for supporting and protecting the said bent portion of the 6. In a thermo-telephone, the combination with a plastic hardening body, of a vi olleston wire passing through the body and having a bent portion projecting out of the same a metal body surrounding and protect ing the plastic hardening body, a socket carrying the outer body, the socket being provided with a rotatable bow for supporting and protecting the said bent portion of the wire, and a bridge connecting the ends of and fixed to the rotatable bow, tlu said bridge being provided with a lug entering the bent portion of the said wire.

In testimony, that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

BRONISLAW ow OZDZ. Witnesses HENRY HASPER, WOLDEMAB HAUPT. 

